🔗 @redstone-finance/casper-connector

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RedStone proposes a completely new modular design where data is first put into a data availability layer and then fetched on-chain. This allows us to broadcast a large number of assets at high frequency to a cheaper layer and put it on-chain only when required by the protocol.

The @redstone-finance/casper-connector module implements an alternative design of providing oracle data to smart contracts. Instead of constantly persisting data on the Casper network storage (by data providers), the information is brought on-chain only when needed (by end users). Until that moment data remains in the decentralised cache layer, which is powered by RedStone light cache gateways and streamr data broadcasting protocol. Data is transferred to the Casper network by end users. The information integrity is verified on-chain through signature checking.

Here also you can find the description of the whole RedStone Oracle model.

• 👨‍💻 Code structure
• 🔥 Connecting to the contract
• ⚡ The Casper Grant Program
• 📄 License

👨‍💻 Code structure

• rust directory contains the casper-network on-chain libraries written in Rust 1.68.2.
  • You can read here how the contracts work.
  • redstone directory contains the RedStone library containing aggregation as well as full data-processing written in Rust
    • There are also various tests of signature verification with the given signers, timestamp validation, value aggregation as well as full data-processing tests with various configurations.
  • tests directory contains various integration and unit tests of contracts having their WASM-compiled code.
• src directory contains the typescript classes, useful for establishing a connection between typescript and casper-network layers.
  • See below, how to connect to the contract.
• test directory contains the TypeScript SDK tests
  • unit tests on real network
  • e2e contract tests on real network

🔥 Connecting to the contract

First, you need to import the connector code to your project

// Typescript
import {
  PriceAdapterCasperContractConnector,
  makeCasperConnection,
} from "@redstone-finance/casper-connector";
// or: import { PriceRelayAdapterCasperContractConnector } from "@redstone-finance/casper-connector";
import { ContractParamsProvider } from "@redstone-finance/sdk";

// Javascript
const {
  PriceAdapterCasperContractConnector,
  makeCasperConnection,
  // or: PriceRelayAdapterCasperContractConnector
} = require("@redstone-finance/casper-connector");
const { ContractParamsProvider } = require("@redstone-finance/sdk");

Then you can invoke the contract methods described above pointing to the selected RedStone data service and requested data feeds.

const prices = new PriceAdapterCasperContractConnector(
  makeCasperConnection(yourConfig),
  yourContractPackageHash
);
/* or const prices = new PriceRelayAdapterCasperContractConnector(
yourWalletOrProvider,
  yourContractAddress
);
*/

const paramsProvider = new ContractParamsProvider({
  dataServiceId: "redstone-main-demo",
  uniqueSignersCount: 1,
  dataPackagesIds: ["ETH", "BTC"],
});

The yourConfig param is required. The example value can be found in the test/e2e/config.ts file.

Now you can access any of the contract's methods by invoking the code:

(await prices.getAdapter()).getPricesFromPayload(paramsProvider); // the method is available only for PriceRelayAdapterCasperContractConnector
(await prices.getAdapter()).writePricesFromPayloadToContract(paramsProvider);
(await prices.getAdapter()).readPricesFromContract(paramsProvider);
(await prices.getAdapter()).readTimestampFromContract();

Installing the dependencies

yarn install

⚡ The Casper Grant Program

The Casper Accelerate Grant Program has been created to exclusively support projects and developers building on the Casper Public Mainnet to grow and secure the Casper Network. Read more here

📄 License

RedStone Casper connector is an open-source and free software released under the BUSL-1.1 License.